Measurement report: Optical characterization, seasonality, and sources of brown carbon in fine aerosols from Tianjin, North China: year-round observations

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Abstract 2.5) at an urban site in Tianjin over a 1-year period. We measured the ultraviolet (UV) light absorption and excitation emission matrix (EEM) fluorescence of the water-soluble BrC (WSBrC) and the water-insoluble but methanol-soluble BrC (WI-MSBrC) in the PM2.5 using a three-dimensional fluorescence spectrometer. The average light absorption efficiency of both WSBrC (Abs 365, WSBrC Abs 365, WI-MSBrC ± ± Mm - 1, respectively) and distinct from season to season. The averages of the fluorescence index (FI) and the biological index (BIX) of WSBrC were lower in summer than in the other seasons and opposite to that of the humification index (HIX), which implied that the secondary formation and further chemical processing of aerosols were more intensive during the summer period than in the other seasons. However, in winter, the higher HIX together with the higher FI and BIX of WI-MSBrC suggested that the BrC loading was mainly influenced by primary emissions from biomass burning and coal combustion. Based on the EEM, the types of fluorophores in WSBrC were divided into humic-like substances (HULIS), including low-oxygenated and high-oxygenated species and protein-like compounds (PLOM), though mostly PLOM in the WI-MSBrC. The direct radiation absorption by both WSBrC and WI-MSBrC in the range of 300–400 nm accounted for ∼ SFE Abs ± ± W g - 1, respectively) in the range 300–700 nm.

Location
Deutsche Nationalbibliothek Frankfurt am Main
Extent
Online-Ressource
Language
Englisch

Bibliographic citation
Measurement report: Optical characterization, seasonality, and sources of brown carbon in fine aerosols from Tianjin, North China: year-round observations ; volume:24 ; number:10 ; year:2024 ; pages:5887-5905 ; extent:19
Atmospheric chemistry and physics ; 24, Heft 10 (2024), 5887-5905 (gesamt 19)

Creator
Dong, Zhichao
Pavuluri, Chandra Mouli
Li, Peisen
Xu, Zhanjie
Deng, Junjun
Zhao, Xueyan
Zhao, Xiaomai
Fu, Pingqing
Liu, Cong-Qiang

DOI
10.5194/acp-24-5887-2024
URN
urn:nbn:de:101:1-2405300436278.035890827210
Rights
Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
Last update
14.08.2025, 10:56 AM CEST

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Associated

  • Dong, Zhichao
  • Pavuluri, Chandra Mouli
  • Li, Peisen
  • Xu, Zhanjie
  • Deng, Junjun
  • Zhao, Xueyan
  • Zhao, Xiaomai
  • Fu, Pingqing
  • Liu, Cong-Qiang

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